For what it's worth, my initial thoughts were 'he's being removed'. Then thinking about it things don't stack up. If you were going to get rid of someone totally you would just announce it: If you were going to move someone upstairs you would get things in place and then just announce it. So, my thoughts are that this is something that, at least to begin with, is temporary but maybe not guaranteed not to become permanent. So maybe a personal or medical issue or even a misconduct investigation (I feel that this one is unlikely)? Time will tell.